Process and apparatus for containing a folded yarn



March 31, 1964 M. RATTI 3,126,696

PROCESS AND APPARATUS FOR CONTAINING A FOLDED YARN Filed March 19,- 1962 INVENTOR MCHEL E /4 77/ 89 45M IJ- United States Patent 3,126,696 PROCESS AND APPARATUS FOR CONTAINING A FOLDED YARN Michele Ratfi, Luino, Varese, Italy, assignor to Michele Ratti S.p.A.

Filed Mar. 19, 1962, Ser. No. 180,905 Claims priority, application Italy May 12, 1961 3 Claims. (Cl. 57-583) This invention relates to a process and apparatus comprising two or more threads that, upon being doubled, retain their original twist or absence of twist unchanged, wherehi the feed bobbins are fixed and the threads are allowed to unravel from the ends of the bobbins, while the rotating part of the apparatus is limited to a sleeve situated underneath one of the bobbins and carrying rotating thread guides that double the threads by winding them symmetrically one about the other.

The accompanying drawings illustrate one preferred and non-restrictive form of embodiment of apparatus for carrying into effect the process according to the invention.

In the drawing:

FIGURE 1 is a side view in partial longitudinal section; and

FIGURE 2 is a crossection taken along the line IIII of FIGURE 1.

The apparatus comprises a first bobbin 1 and a second bobbin 2, both fixed, the bobbin 1 by being mounted on free base 3 that is kept from moving by the attraction between a magnet 4 carried on the base 3 and a fixed magnet 4', while the bobbin 2 is mounted on a fixed base 5. The bobbin 1 has a hollow, lengthwise cavity 6 passing along its axis from one end to the other, inside of which extends a tubular portion 3' of the supporting base 3, to support an axial tube 7 rotatable on ballbearings 8 and firmly secured to an extension 9' of a whorl sleeve 9 driven by a belt 10. A thread-guide tube 11, mounted on ball-bearings 12, is freely rotatable inside sleeve or whorl 9. A space between the bottom of the tube 7 and the top of the tube 11 contains a deflector 13 having the shape of a quadrilateral whose concave sides 13' facilitate threading of the threads. The upper pair of sides are longer than the lower pair.

Two symmetrical thread guides 14 are provided at the sides of the deflector 13, these being horizontal rods rigidly secured to the sleeve 9 and spaced away from the axis of the bobbin 1 and the tubes 7, 11. The rotating sleeve or whorl 9 also carries a flanged disc or plate 15 having at its edge a thread guide 16 capable of taking the thread or threads coming from the bobbin 2 by way of thread guides 17 co-axially above the bobbin 1 and 18, 18' co-axially above the bobbin 2.

The thread or threads A leaving the bobbin 1 and the thread or threads B leaving the bobbin 2 simply slip off their respective fixed bobbins. The thread or threads A pass through a co-axial guide 19 into the cavity 6 of the bobbin 1 and then pass through the tube 7 for deflection round one thread guide 14 and return to the axis at a point 20 to meet the other thread or threads B, which are rotated about the first thread or threads A due to the action of the thread guide 16 mounted on the rotating disc or plate 15 forming a balloon, starting at the 3,126,696 Patented Mar. 31., 1954 threadguide 17. Where the threads A and B meet at 20, both have substantially the same inclination with respect to the vertical, and thus are symmetrically doubled, with due attention given to the tensions of the respective threads.

What I claim is:

1. Apparatus for producing a folded yarn formed by at least two fine threads, which upon being doubled retain their original twist or absence of twist unchanged comprising: a first fixed bobbin having a hollow central cavity passing therethrough from one end to the other; a second fixed bobbin; first fixed threadguide means located coaxially above said first bobbin; second fixed threadguide means positioned coaxially above said second bobbin; a coaxial, driven whorl sleeve; third rotatable threadguide means for forming a balloon and presenting a friction resistance to the yarn which decreases due to centrifugal forces when its rotational speed increases in order to wind the thread or threads originating at the second bobbin around the thread or threads originating at the first bobbin; means mounting said third threadguide means for rotation with said whorl sleeve and about said first bobbin; first rotating tube means carried by said whorl sleeve for transporting the thread or threads coming from said first bobbin centrally along the latters axis; a deflector located coaxially at the end of the first bobbin opposite to said first threadguide means; fourth threadguide means mounted for rotation with said whorl sleeve and adjacent said deflector for guiding the thread or threads emerging from said first tube means to said deflector and then to a doubling point where such thread or threads encounter the other thread or threads from the balloon, said fourth threadguide means presenting a friction resistance which decreases due to centrifugal forces when its rotational speed increases; and second, freely-rotatable tube means mounted on the whorl sleeve coaxially with said first tube means for receiving the threads doubled to one another and leading away the folded yarn thus produced.

2. Apparatus according to claim 1, wherein said fourth rotating threadguide means comprises a pair of rods disposed within openings in said whorl sleeve at the sides of said deflector.

3. Apparatus according to claim 1, wherein the fourth rotating threadguide means comprises two bars mounted symmetrically on said whorl sleeve at the sides of the deflector, the thread or threads originating at the first bobbin being guided by one of said bars and the thread or threads originating at the second bobbin being guided by the other of said bars, said two bars being situated symmetrically at a predetermined distance from the axis of said first bobbin and from said doubling point, so that the last segments of the threads coming from the two bobbins have substantially the same inclination with respect to said axis at the doubling point Where the threads meet in order to produce a symmetrical doubling thereof.

References Cited in the file of this patent UNITED STATES PATENTS 

1. APPARATUS FOR PRODUCING A FOLDED YARN FORMED BY AT LEAST TWO FINE THREADS, WHICH UPON BEING DOUBLED RETAIN THEIR ORIGINAL TWIST OR ABSENCE OF TWIST UNCHANGED COMPRISING: A FIRST FIXED BOBBIN HAVING A HOLLOW CENTRAL CAVITY PASSING THERETHROUGH FROM ONE END TO THE OTHER; A SECOND FIXED BOBBIN; FIRST FIXED THREADGUIDE MEANS LOCATED COAXIALITY ABOVE SAID FIRST BOBBIN; SECOND FIXED THREADGUIDE MEANS POSITIONED COAXIALLY ABOVE SAID SECOND BOBBIN; A COAXIAL, DRIVEN WHORL SLEEVE; THIRD ROTATABLE THREADGUIDE MEANS FOR FORMING A BALLOON AND PRESENTING A FRICTION RESISTANCE TO THE YARN WHICH DECREASES DUE TO CENTRIFUGAL FORCES WHEN ITS ROTATIONAL SPEED INCREASES IN ORDER TO WIND THE THREAD OR THREADS ORIGINATING AT THE SECOND BOBBIN AROUND THE THREAD OR THREADS ORIGINATING AT THE FIRST BOBBIN; MEANS MOUNTING SAID THIRD THREADGUIDE MEANS FOR ROTATION WITH SAID WHORL SLEEVE AND ABOUT SAID FIRST BOBBIN; FIRST ROTATING TUBE MEANS CARRIED BY SAID WHORL SLEEVE FOR TRANSPORTING THE THREAD OR THREADS COMING FROM SAID FIRST BOBBIN CENTRALLY ALONG THE LATTER''S AXIS; A DEFLECTOR LOCATED COAXIALLY AT THE END OF THE FIRST BOBBIN OPPOSITE TO SAID FIRST THREADGUIDE MEANS; FOURTH THREADGUIDE MEANS MOUNTED FOR ROTATION WITH SAID WHORL SLEEVE AND ADJACENT SAID DEFLECTOR FOR GUIDING THE THREAD OR THREADS EMERGING FROM SAID FIRST TUBE MEANS TO SAID DEFLECTOR AND THEN TO A DOUBLING POINT WHERE SUCH THREAD OR THREADS ENCOUNTER THE OTHER THREAD OR THREADS FROM THE BALLOON, SAID FOURTH THREADGUIDE MEANS PRESENTING A FRICTION RESISTANCE WHICH DECREASES DUE TO CENTRIFUGAL FORCES WHEN ITS ROTATIONAL SPEED INCREASES; AND SECOND, FREELY-ROTATABLE TUBE MEANS MOUNTED ON THE WHORL SLEEVE COAXIALLY WITH SAID FIRST TUBE MEANS FOR RECEIVING THE THREADS DOUBLED TO ONE ANOTHER AND LEADING AWAY THE FOLDED YARN THUS PRODUCED. 